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✏️ Editing: results.js

define([
  'jquery',
  './utils'
], function ($, Utils) {
  function Results ($element, options, dataAdapter) {
    this.$element = $element;
    this.data = dataAdapter;
    this.options = options;

Results.__super__.constructor.call(this);
  }

Utils.Extend(Results, Utils.Observable);

Results.prototype.render = function () {
    var $results = $(
      '<ul class="select2-results__options" role="tree"></ul>'
    );

if (this.options.get('multiple')) {
      $results.attr('aria-multiselectable', 'true');
    }

this.$results = $results;

return $results;
  };

Results.prototype.clear = function () {
    this.$results.empty();
  };

Results.prototype.displayMessage = function (params) {
    var escapeMarkup = this.options.get('escapeMarkup');

this.clear();
    this.hideLoading();

var $message = $(
      '<li role="treeitem" aria-live="assertive"' +
      ' class="select2-results__option"></li>'
    );

var message = this.options.get('translations').get(params.message);

$message.append(
      escapeMarkup(
        message(params.args)
      )
    );

$message[0].className += ' select2-results__message';

this.$results.append($message);
  };

Results.prototype.hideMessages = function () {
    this.$results.find('.select2-results__message').remove();
  };

Results.prototype.append = function (data) {
    this.hideLoading();

var $options = [];

if (data.results == null || data.results.length === 0) {
      if (this.$results.children().length === 0) {
        this.trigger('results:message', {
          message: 'noResults'
        });
      }

return;
    }

data.results = this.sort(data.results);

for (var d = 0; d < data.results.length; d++) {
      var item = data.results[d];

var $option = this.option(item);

$options.push($option);
    }

this.$results.append($options);
  };

Results.prototype.position = function ($results, $dropdown) {
    var $resultsContainer = $dropdown.find('.select2-results');
    $resultsContainer.append($results);
  };

Results.prototype.sort = function (data) {
    var sorter = this.options.get('sorter');

return sorter(data);
  };

Results.prototype.highlightFirstItem = function () {
    var $options = this.$results
      .find('.select2-results__option[aria-selected]');

var $selected = $options.filter('[aria-selected=true]');

// Check if there are any selected options
    if ($selected.length > 0) {
      // If there are selected options, highlight the first
      $selected.first().trigger('mouseenter');
    } else {
      // If there are no selected options, highlight the first option
      // in the dropdown
      $options.first().trigger('mouseenter');
    }

this.ensureHighlightVisible();
  };

Results.prototype.setClasses = function () {
    var self = this;

this.data.current(function (selected) {
      var selectedIds = $.map(selected, function (s) {
        return s.id.toString();
      });

var $options = self.$results
        .find('.select2-results__option[aria-selected]');

$options.each(function () {
        var $option = $(this);

var item = $.data(this, 'data');

// id needs to be converted to a string when comparing
        var id = '' + item.id;

if ((item.element != null && item.element.selected) ||
            (item.element == null && $.inArray(id, selectedIds) > -1)) {
          $option.attr('aria-selected', 'true');
        } else {
          $option.attr('aria-selected', 'false');
        }
      });

});
  };

Results.prototype.showLoading = function (params) {
    this.hideLoading();

var loadingMore = this.options.get('translations').get('searching');

var loading = {
      disabled: true,
      loading: true,
      text: loadingMore(params)
    };
    var $loading = this.option(loading);
    $loading.className += ' loading-results';

this.$results.prepend($loading);
  };

Results.prototype.hideLoading = function () {
    this.$results.find('.loading-results').remove();
  };

Results.prototype.option = function (data) {
    var option = document.createElement('li');
    option.className = 'select2-results__option';

var attrs = {
      'role': 'treeitem',
      'aria-selected': 'false'
    };

if (data.disabled) {
      delete attrs['aria-selected'];
      attrs['aria-disabled'] = 'true';
    }

if (data.id == null) {
      delete attrs['aria-selected'];
    }

if (data._resultId != null) {
      option.id = data._resultId;
    }

if (data.title) {
      option.title = data.title;
    }

if (data.children) {
      attrs.role = 'group';
      attrs['aria-label'] = data.text;
      delete attrs['aria-selected'];
    }

for (var attr in attrs) {
      var val = attrs[attr];

option.setAttribute(attr, val);
    }

if (data.children) {
      var $option = $(option);

var label = document.createElement('strong');
      label.className = 'select2-results__group';

var $label = $(label);
      this.template(data, label);

var $children = [];

for (var c = 0; c < data.children.length; c++) {
        var child = data.children[c];

var $child = this.option(child);

$children.push($child);
      }

var $childrenContainer = $('<ul></ul>', {
        'class': 'select2-results__options select2-results__options--nested'
      });

$childrenContainer.append($children);

$option.append(label);
      $option.append($childrenContainer);
    } else {
      this.template(data, option);
    }

$.data(option, 'data', data);

return option;
  };

Results.prototype.bind = function (container, $container) {
    var self = this;

var id = container.id + '-results';

this.$results.attr('id', id);

container.on('results:all', function (params) {
      self.clear();
      self.append(params.data);

if (container.isOpen()) {
        self.setClasses();
        self.highlightFirstItem();
      }
    });

container.on('results:append', function (params) {
      self.append(params.data);

if (container.isOpen()) {
        self.setClasses();
      }
    });

container.on('query', function (params) {
      self.hideMessages();
      self.showLoading(params);
    });

container.on('select', function () {
      if (!container.isOpen()) {
        return;
      }

self.setClasses();
      self.highlightFirstItem();
    });

container.on('unselect', function () {
      if (!container.isOpen()) {
        return;
      }

self.setClasses();
      self.highlightFirstItem();
    });

container.on('open', function () {
      // When the dropdown is open, aria-expended="true"
      self.$results.attr('aria-expanded', 'true');
      self.$results.attr('aria-hidden', 'false');

self.setClasses();
      self.ensureHighlightVisible();
    });

container.on('close', function () {
      // When the dropdown is closed, aria-expended="false"
      self.$results.attr('aria-expanded', 'false');
      self.$results.attr('aria-hidden', 'true');
      self.$results.removeAttr('aria-activedescendant');
    });

container.on('results:toggle', function () {
      var $highlighted = self.getHighlightedResults();

if ($highlighted.length === 0) {
        return;
      }

$highlighted.trigger('mouseup');
    });

container.on('results:select', function () {
      var $highlighted = self.getHighlightedResults();

if ($highlighted.length === 0) {
        return;
      }

var data = $highlighted.data('data');

if ($highlighted.attr('aria-selected') == 'true') {
        self.trigger('close', {});
      } else {
        self.trigger('select', {
          data: data
        });
      }
    });

container.on('results:previous', function () {
      var $highlighted = self.getHighlightedResults();

var $options = self.$results.find('[aria-selected]');

var currentIndex = $options.index($highlighted);

// If we are already at te top, don't move further
      if (currentIndex === 0) {
        return;
      }

var nextIndex = currentIndex - 1;

// If none are highlighted, highlight the first
      if ($highlighted.length === 0) {
        nextIndex = 0;
      }

var $next = $options.eq(nextIndex);

$next.trigger('mouseenter');

var currentOffset = self.$results.offset().top;
      var nextTop = $next.offset().top;
      var nextOffset = self.$results.scrollTop() + (nextTop - currentOffset);

if (nextIndex === 0) {
        self.$results.scrollTop(0);
      } else if (nextTop - currentOffset < 0) {
        self.$results.scrollTop(nextOffset);
      }
    });

container.on('results:next', function () {
      var $highlighted = self.getHighlightedResults();

var $options = self.$results.find('[aria-selected]');

var currentIndex = $options.index($highlighted);

var nextIndex = currentIndex + 1;

// If we are at the last option, stay there
      if (nextIndex >= $options.length) {
        return;
      }

var $next = $options.eq(nextIndex);

$next.trigger('mouseenter');

var currentOffset = self.$results.offset().top +
        self.$results.outerHeight(false);
      var nextBottom = $next.offset().top + $next.outerHeight(false);
      var nextOffset = self.$results.scrollTop() + nextBottom - currentOffset;

if (nextIndex === 0) {
        self.$results.scrollTop(0);
      } else if (nextBottom > currentOffset) {
        self.$results.scrollTop(nextOffset);
      }
    });

container.on('results:focus', function (params) {
      params.element.addClass('select2-results__option--highlighted');
    });

container.on('results:message', function (params) {
      self.displayMessage(params);
    });

if ($.fn.mousewheel) {
      this.$results.on('mousewheel', function (e) {
        var top = self.$results.scrollTop();

var bottom = self.$results.get(0).scrollHeight - top + e.deltaY;

var isAtTop = e.deltaY > 0 && top - e.deltaY <= 0;
        var isAtBottom = e.deltaY < 0 && bottom <= self.$results.height();

if (isAtTop) {
          self.$results.scrollTop(0);

e.preventDefault();
          e.stopPropagation();
        } else if (isAtBottom) {
          self.$results.scrollTop(
            self.$results.get(0).scrollHeight - self.$results.height()
          );

e.preventDefault();
          e.stopPropagation();
        }
      });
    }

this.$results.on('mouseup', '.select2-results__option[aria-selected]',
      function (evt) {
      var $this = $(this);

var data = $this.data('data');

if ($this.attr('aria-selected') === 'true') {
        if (self.options.get('multiple')) {
          self.trigger('unselect', {
            originalEvent: evt,
            data: data
          });
        } else {
          self.trigger('close', {});
        }

return;
      }

self.trigger('select', {
        originalEvent: evt,
        data: data
      });
    });

this.$results.on('mouseenter', '.select2-results__option[aria-selected]',
      function (evt) {
      var data = $(this).data('data');

self.getHighlightedResults()
          .removeClass('select2-results__option--highlighted');

self.trigger('results:focus', {
        data: data,
        element: $(this)
      });
    });
  };

Results.prototype.getHighlightedResults = function () {
    var $highlighted = this.$results
    .find('.select2-results__option--highlighted');

return $highlighted;
  };

Results.prototype.destroy = function () {
    this.$results.remove();
  };

Results.prototype.ensureHighlightVisible = function () {
    var $highlighted = this.getHighlightedResults();

if ($highlighted.length === 0) {
      return;
    }

var $options = this.$results.find('[aria-selected]');

var currentIndex = $options.index($highlighted);

var currentOffset = this.$results.offset().top;
    var nextTop = $highlighted.offset().top;
    var nextOffset = this.$results.scrollTop() + (nextTop - currentOffset);

var offsetDelta = nextTop - currentOffset;
    nextOffset -= $highlighted.outerHeight(false) * 2;

if (currentIndex <= 2) {
      this.$results.scrollTop(0);
    } else if (offsetDelta > this.$results.outerHeight() || offsetDelta < 0) {
      this.$results.scrollTop(nextOffset);
    }
  };

Results.prototype.template = function (result, container) {
    var template = this.options.get('templateResult');
    var escapeMarkup = this.options.get('escapeMarkup');

var content = template(result, container);

if (content == null) {
      container.style.display = 'none';
    } else if (typeof content === 'string') {
      container.innerHTML = escapeMarkup(content);
    } else {
      $(container).append(content);
    }
  };

return Results;
});

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